Strontium diffusion in Durango fluorapatite was measured under anhydrous conditions. Diffusants were introduced into the apatite by ion implantation of Sr or by immersion in a Sr back-scattering spectrometry. The diffusivities could be described by the Arrhenius relationship:

D(cm2/s) = 2.7 x 10-3 exp[-65.0(kcal/mol)/RT]

for diffusion perpendicular to c at 700 to 1050C.

D.J.Cherniak, F.J.Ryerson: Geochimica et Cosmochimica Acta, 1993, 57[19], 4653-62